Square Enix: so so many but at least a few FF14 expansions, FF15, Nier: Automata, Dragon Quest XI, Octopath Traveler, Kingdom Hearts III, Final Fantasy 16, Final Fantasy VII Rebirth
Bethesda: The Elder Scrolls Online, Fallout 4, Fallout 76, Starfield
Epic: Robo Recall, Fornite.
Epic cancelled Paragon and Unreal Tournament and Fortnite is a live service game where they're constantly shipping content so its harder to define single releases but they have new money coming in from new content.
And these are only from the main studio, not the dozens of games published by these entities.
Your square list, for example, crosses 8 different studios.
My original question was poorly worded; I meant how many games -per studio- are being shipped by these big cos?
Arguably teams are tied to and only ever ship a single game so I'm not really sure what you're arguing at this point.
Where are you getting a decade from? Consoles ship more often then that.